<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .active {
      background: red;
    }

    .content {
      width: 200px;
      height: 200px;
      font-size: 30px;
      text-align: center;
      line-height: 200px;
      border: 1px solid #fc6;

    }
  </style>
</head>

<body>
  <div id="app">
    <button v-for="(tab,index) in tabs" @click="switchTab(index)" :class="{active: activeIndex === index}">{{tab.title}}</button>
    
    <div  v-for="(tab,index) in tabs" v-show="activeIndex === index" class="content">{{tab.content}}</div>
    
  </div>
  <script src="./vue.js"></script>
  <script>
    const vm = new Vue({
      el: "#app",
      data: {
        tabs:[
          {
            title:'标题1',
            content: '内容1'
          },
          {
            title:'标题2',
            content: '内容2'
          },
          {
            title:'标题3',
            content: '内容3'
          },
          {
            title:'标题4',
            content: '内容4'
          }
        ],
        activeIndex: 0
      },
      methods:{
        switchTab(index){
          this.activeIndex = index;
        }
      }
    })
  </script>
</body>

</html>